False positive invalid-unary-operand-type for return value of np.diff()

[eniemela3]

Steps to reproduce

1. Create a file, say file.py with the following contents:

import numpy as np

var = -np.diff(np.array([1, 2.5, 5]))
print(type(var))

2. Run pylint file.py

Current behavior

Pylint output contains file.py:3:6: E1130: bad operand type for unary -: generator (invalid-unary-operand-type).

Expected behavior

The type of the return value from np.diff should be recognized correctly as a ndarray, not a generator, and the error should not be reported.

pylint --version output

pylint 2.3.1
astroid 2.2.5
Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:05:16) [MSC v.1915 32 bit (Intel)]

[hippo91]

@eniemela3 thank you for the report.
It should have been corrected through pylint-dev/astroid#664.
Can you confirm please? Thanks again.